Safety door-bolt.



B. F. POSS.

SAFETY DOOR BOLT.

APPLICATION FILED MAR. 20, 1913.

0 7 241 Patented July 15, 1913.

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r O "Q I l L I IL m e I01 a 1 T I d o o Inventor: ml-M1101; r nills cnnumum PLANOURAPH co.. WASHINGTON, 1). c4

unrrnn STATES PATENT onnion.

BENJAMIN F. FOSS, OF PORTLAND, MAINE.

SAFETY DOOR-BOLT.

Specification of Letters Patent.

Application filed March 20, 1913.

Patented July 15,1913.

Serial No. 755,608.

To all whom it may concern:

Be it known that I, BENJAMIN F. Foss, of Portland, in the county of Cumberland and State of Maine, have invented certain new and useful Improvements in Safety Door-Bolts, of which the following is a specificatio My invention relates to a safety device for securing doors in such a way as to yield to any unusual strain from the inside and known as panic doors.

The invention is directed particularly to an improvement or addition to the bolt shown in my Letters Patent No. 1,038,111, dated Sept. 10, 1912.

The object of the invention is to construct a fastening device of the general character shown in my said Letters Patent with means which will prevent its being accidentally locked and will allow it when locked to be unlocked by extra weight thrown 011 it from the inside of the door.

My invent-ion will best be understood by reference to the accompanying drawing, in which is shown my patented door bolt operated by an operating mechanism constructed according to my invention.

In the drawing, Figure 1 is a front elevation of a pair of double doors with my panic bolt applied and with portions shown in sections. Fig. 2 is a side elevation of the operating device with the horizontal bar in section, and Fig. 3 is a section on the line 00 w of Fig. 1.

Referring to the drawing, a and b are the double doors, 0 is the casing of one of my patented bolts, (Z is the bolt, 6 the antifriction roller on the bottom and f is the recessed striker all as shown in my said patent and requiring no further description.

9 represents the bolt spindle and g the bifurcated head at the upper end of the spindle.

The bolt (Z is raised to its frictional position and depressed to its locking position by a pivoted arm the raising and lowering of which works the bolt (Z. As here shown, the arm m is secured on the end of a crank. shaft it having one or more cranks 7i and journaled in a housing 2' secured to the door. The crank h is connected by a link j to the bifurcated head 9 so that as the shaft turns in either direction the bolt (Z will be raised or lowered as the case may be.

As here shown, I have placed one of my patented bolts at the top and one at the bottom of the door, the parts being di'iplicated but of course the operating device may be used with one or more than one.

In connection with the operating arm on I make use of a horizontal panic bar 79 secured to the outer end of the arm m and ex tending horizontally across the. door and there connected with a second pivoted arm p by which it is secured to the door.

The arm m is secured to the shaft h in such a position that when the arm is either depressed or raised and thrown over against the door the spindles g and the bolts will be retracted to their frictional position. lVhen in that position the door may be forced open by causing the roller 6 to ride up on the inclined striker. hen the arm and the bar are up the former at right angles to the door and adapted to move in a vertical plane, the bolt is in its lower po sition and the end is locked in the recesses at each side of the bridge on which the roll rests, as set out in my said patent.

Means are provided for fastening the arm m in its lower or unlocking position so that it cannot be accidentally changed to its locking position. As here shown, I provide a spring thumb latch is on the arm m and this latch engages a square shouldered. notch 0 in a segment 0 arranged on the side of the casing i and adjacent to the arm m. lVhen the catch is in the notch 0 then neither the arm nor the bar can be moved without releasing the latch and thus the bolt is held in its frictional or unlocked position until it is desired to lock the door. The bar is held in its locked position by a V-shaped notch 0 but when in that position it may be readily depressed to its unlocked position by a moderate downward pressure as when a i am occurs at the door. If the arm instead of swinging downward swings upward and backward against the door, the bolt in either case is unlocked and any extra pressure on the door forces it open.

In practical use the bar is depressed and the bolt kept in its unlocked position during the time the building is occupied. During this time the stationary half of the double door is held with sumcient rigidity to permit the swinging half of the door to be used freely for passing in and out and it may even be locked and admission prevented from the outside. The bar cannot be lifted to its locked position accidentally as it is necessary to reach over behind the bar and release the latch before it can be moved from its unlocked position. When it is desired to close the building and lock it the bar is raised, forcing the bolts down to their locked position but as explained, a pressure on the bar will unlock the bolts so that the bolts are always safe.

Other forms of bolt than that shown in my said patent may be used in connection with the safety operating devices described but such bolts must have as a whole an unlocked or frictional position and a locked or For instance in Flg. 1 1f the surface 1' should descend far positively engaged position.

enough to strike the upper end of the spindle s so that the roll 6 could not come out of its recess, then the lower end of the dead bolt would not need to be positively held in a recess.

A panic door constructed according to my invention is capable of being used on double doors or on single doors and its use is consistentwith the ordinary use of the double doors as they are used from day to day.

I claim 1. In a panic door, the combination of a fastening bolt having an upper position ing notch positioned to receive said latch when the bolt is raised and having a V- shaped engaging notch positioned to receive the latch when the bolt is lowered.

2. In a panic door, the combination of a fastening bolt, an arm pivoted to move in a vertical plane and extending when the bolt is locked at right angles to the surface of the door, mechanism connecting said arm and bolt whereby the bolt is withdrawn when the arm is moved-in either direction,

a horizontal actuating bar connected with the end of the arm.

In testimony whereof Ihave atliXed my signature, in presence of two Witnesses.

BENJAMIN F. FOSS.

WVitnesses S. V. Barns, C. B. CREIGHTON.

Copies of this patent may be obtained for 'five cents each, by addressing the Commissioner of Patents. 7

Washington, DIG. I 

